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{[3+4x(7-2x)]:5-2}x10=10


Răspuns :

{[3+4x(7-2x)]:5-2}x10=10 |:10
[3+4x(7-2x)]:5-2=1 |+2
[3+4x(7-2x)]:5=3 |x5
3+4x(7-2x)=15 |-3
4x(7-2x)=12 |:4
7-2x=3 |+2x
7=2x+3 |-3
4=2x |:2
x=2